JPS63308402A - Digital temperature compensated oscillator - Google Patents
Digital temperature compensated oscillatorInfo
- Publication number
- JPS63308402A JPS63308402A JP14443687A JP14443687A JPS63308402A JP S63308402 A JPS63308402 A JP S63308402A JP 14443687 A JP14443687 A JP 14443687A JP 14443687 A JP14443687 A JP 14443687A JP S63308402 A JPS63308402 A JP S63308402A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- output
- oscillator
- temperature
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000010355 oscillation Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 239000013078 crystal Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Oscillators With Electromechanical Resonators (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
Description
【発明の詳細な説明】
〔概要〕
本発明は温度センサの出力によって信号発振器の出力の
分周比を制御することによって、温度に変化を補償する
。DETAILED DESCRIPTION OF THE INVENTION [Summary] The present invention compensates for changes in temperature by controlling the division ratio of the output of a signal oscillator using the output of a temperature sensor.
本発明は温度センサの出力によって信号発振器の分周器
の分周比を制御するディジタル温度補償発振器に関する
ものである。The present invention relates to a digital temperature compensated oscillator that controls the frequency division ratio of a frequency divider of a signal oscillator based on the output of a temperature sensor.
通信、電子装置に広く使用される水晶発振子を用いた水
晶発振器の発振周波数は、水晶発振子が周囲温度によっ
てその振動周波数が変化し、従って信号発振器の出力周
波数が変化するので、信号発振器の発振周波数を安定に
保持することが要望されていた。The oscillation frequency of a crystal oscillator that uses a crystal oscillator, which is widely used in communications and electronic devices, changes depending on the ambient temperature of the crystal oscillator, and therefore the output frequency of the signal oscillator changes. It was desired to keep the oscillation frequency stable.
第３図はこのための従来の温度補償（恒温種付）発振器
の構成ブロック図を示す。FIG. 3 shows a block diagram of a conventional temperature compensated (constant temperature seeded) oscillator for this purpose.
図において、１は圧電振動子、２は信号発振回路、３は
緩衝増幅器、４は圧電振動子１と信号発振回路２と緩衝
増幅器３とからなる信号発振器、５は恒温槽、６は温度
センサ、７は温度センサ６の温度によって恒温槽の温度
を所定の一定温度に制御する恒温槽制御回路である。In the figure, 1 is a piezoelectric vibrator, 2 is a signal oscillation circuit, 3 is a buffer amplifier, 4 is a signal oscillator consisting of the piezoelectric vibrator 1, a signal oscillation circuit 2, and a buffer amplifier 3, 5 is a thermostatic oven, and 6 is a temperature sensor. , 7 is a constant temperature bath control circuit that controls the temperature of the constant temperature bath to a predetermined constant temperature based on the temperature of the temperature sensor 6.
圧電振動子１は例えば、水晶振動子であって、信号発振
回路２で発振した出力信号は出力負荷の影響を防止する
緩衝増幅器３を介して出力端子に接続される。The piezoelectric vibrator 1 is, for example, a crystal vibrator, and an output signal oscillated by a signal oscillation circuit 2 is connected to an output terminal via a buffer amplifier 3 that prevents the influence of an output load.
信号発振器４は恒温槽５に格納され、装置の環境温度以
上の一定の温度に電熱器で加熱され、恒温槽５の周囲温
度を温度センサによって検出し、この検出出力によって
恒温槽制御部７が電熱器を断続制御して周囲温度に関わ
らず恒温槽５の内部温度を一定に保持するようにしてい
る。The signal oscillator 4 is stored in a thermostatic oven 5, heated by an electric heater to a constant temperature higher than the environmental temperature of the device, and the ambient temperature of the thermostatic oven 5 is detected by a temperature sensor, and the thermostatic oven controller 7 is controlled by this detection output. The electric heater is controlled intermittently to maintain the internal temperature of the thermostatic oven 5 constant regardless of the ambient temperature.
この従来の方式では、恒温槽の内部温度を一定に保持す
るために通常、上記したように電熱による温度制御が行
われるが、高度の周波数安定度を必要とする場合はその
制御手段も複雑になり、また、恒温槽を用いるので占有
空間は大きく且つ消費電力も大きくなると云う問題があ
った。In this conventional method, temperature control is usually performed using electric heating as described above in order to maintain a constant internal temperature of the thermostatic chamber, but if a high degree of frequency stability is required, the control method becomes complicated. Furthermore, since a constant temperature bath is used, there is a problem that the space occupied is large and the power consumption is also large.
上記した目的を達成するため第１図の本発明の原理ブロ
ック図に示すように、信号発振器４と、分周比が可変な
分周器９と、温度センサ６と、アナログ／ディジタル変
換器８と、分周器９の分周比を制御する制御回路１０と
で回路構成される。In order to achieve the above object, as shown in the principle block diagram of the present invention in FIG. and a control circuit 10 that controls the frequency division ratio of the frequency divider 9.
温度センサ６が信号発振器４の、特に圧電振動子の温度
を計測したアナログ信号出力をアナログ／ディジタル変
換器（Ａ／Ｄ変換器）８によってディジタル信号に変換
し、制御回路１０に入力する。The temperature sensor 6 measures the temperature of the signal oscillator 4, particularly the piezoelectric vibrator, and an analog signal output is converted into a digital signal by an analog/digital converter (A/D converter) 8 and input to the control circuit 10.
制御回路１０は温度変化によって生じる信号発振器の周
波数変化を補償する分周器９の分周比を計算する。The control circuit 10 calculates a frequency division ratio of the frequency divider 9 that compensates for changes in the frequency of the signal oscillator caused by temperature changes.
分周器９は制御回路１０からの信号によって指示された
分周比で信号発振器４の出力周波数を分周し、その出力
信号を出力端子に出力する。Frequency divider 9 divides the output frequency of signal oscillator 4 by a frequency division ratio instructed by a signal from control circuit 10, and outputs the output signal to an output terminal.
以下、第１図の本発明の原理ブロック図と、第２図は本
発明のディジタル温度補償発振器の一実施例の部分ブロ
ック図を参照して本発明の詳細な説明する。The present invention will be described in detail below with reference to the principle block diagram of the present invention shown in FIG. 1 and the partial block diagram of an embodiment of the digital temperature compensated oscillator of the present invention shown in FIG.
なお、全図を通じて同一符号は同一対象物を示す。Note that the same reference numerals indicate the same objects throughout the figures.
第２図において、分周器９のカウンタ９１の入力端子に
は、第１図に示した信号発振回路２が圧電発振子、例え
ば水晶振動子１の振動周波数で発振し、緩衝増幅器３を
介して出力する周波数ｆの出力信号が入力する。In FIG. 2, the signal oscillation circuit 2 shown in FIG. An output signal with a frequency f to be outputted is input.
そして、カウンタ９１の出力は、入力するパルス数が所
定の数に達した時１つパルスを出力するようパルス数ご
との出力端子をもつ。The output of the counter 91 has output terminals for each number of pulses so that one pulse is output when the number of input pulses reaches a predetermined number.
そのそれぞれの出力端子にはアンド回路９２が接続され
、制御回路１０からの分周比信号によってアンド回路９
２の１つはアンド条件が成立して信号発振器４のパルス
をを出力する。An AND circuit 92 is connected to each output terminal, and the AND circuit 92 is
2, the AND condition is satisfied and the signal oscillator 4 outputs a pulse.
そして、同時にカウンタ１０をリセットする。At the same time, the counter 10 is reset.
一方、温度センサ６は、例えばサーミスタのような温度
検知素子が信号発振器４の温度、特に水晶発振器の温度
を計測したアナログ信号を出力する。On the other hand, the temperature sensor 6 outputs an analog signal obtained by a temperature sensing element such as a thermistor measuring the temperature of the signal oscillator 4, particularly the temperature of the crystal oscillator.
アナログ／ディジタル変換器８はこの温度アナログ信号
をディジタル信号に変換して、制御回路１０に出力する
。The analog/digital converter 8 converts this temperature analog signal into a digital signal and outputs it to the control circuit 10.
制御回路１０は通常マイクロプロセッサを用い、このア
ナログ／ディジタル変換器８から出力される信号から信
号発振器４の周波数変化を補償する分周比を計算してカ
ウンタ９１のアンド回路９２を選択する。The control circuit 10 normally uses a microprocessor to calculate a frequency division ratio that compensates for the frequency change of the signal oscillator 4 from the signal output from the analog/digital converter 8 and selects the AND circuit 92 of the counter 91.
以下、制御回路１０の動作を説明する。The operation of the control circuit 10 will be explained below.
信号発振器の発振周波数をｆとし、温度による周波数の
変化分をΔＦとする。Let f be the oscillation frequency of the signal oscillator, and let ΔF be the change in frequency due to temperature.
そして、分周比をＮとし、分周比の変化をΔＮ、発振周
波数Ｆとし、発振周波数の変化をΔＦとする。Then, let the frequency division ratio be N, the change in the frequency division ratio be ΔN, the oscillation frequency F, and the change in the oscillation frequency be ΔF.
Ｆ＝ｆ／Ｎ からその変化分ΔＦは、 ΔＦ−−Ｃｆ／Ｎ２）ΔＮ＋（１／Ｎ）Δｆとなる。F=f/N The change ΔF from ΔF−−Cf/N2)ΔN+(1/N)Δf.
出力周波数を安定にするためには出力周波数の変化分を
０、即ち、ΔＦ＝０とするためには、（ｆ／Ｎ”）ΔＮ
−（１／Ｎ）Δｆ
とするとよい。In order to stabilize the output frequency, in order to make the change in the output frequency 0, that is, ΔF=0, (f/N") ΔN
-(1/N)Δf is preferable.
従って、 ΔＮ／Ｎ−Δｆ／ｆ となる。Therefore, ΔN/N-Δf/f becomes.
ここで、温度センサ６が計測する温度をＴとし、その変
化分をΔＴとすると、Δｆ／ｆとΔＴ／Ｔとの間に、
Δｆ／ｆ＝Ｇ（ΔＴ／Ｔ）
を成立させる関数Ｇが存在すると、
ΔＮ／Ｎ＝Ｇ （ΔＴ／Ｔ）
となり、予めこの関数関係を設定することによって制御
回路１０はΔＮ／Ｎを計算し、さらにこの値に対応する
分周値Ｎ”を算出する。Here, if the temperature measured by the temperature sensor 6 is T and its change is ΔT, then a function G that establishes Δf/f=G(ΔT/T) between Δf/f and ΔT/T is If it exists, ΔN/N=G (ΔT/T), and by setting this functional relationship in advance, the control circuit 10 calculates ΔN/N and further calculates the frequency division value N'' corresponding to this value.
制御回路１０はこの分周値Ｎ°に対応するカウンタの出
力端子に分周比信号を送出し、アンド条件が成立したア
ンド回路９２から出力信号が出力される。The control circuit 10 sends a frequency division ratio signal to the output terminal of the counter corresponding to this frequency division value N°, and an output signal is output from the AND circuit 92 when the AND condition is satisfied.
また、制御回路１０が温度Ｔに対応する分周比Ｎを示す
テーブルを有し、そのテーブルに基づいてカウンタ９１
の出力を選択するようにしてもよいのは云うまでもない
。Further, the control circuit 10 has a table showing the frequency division ratio N corresponding to the temperature T, and based on the table, the counter 91
It goes without saying that the output may be selected.
以上性べてきたように、本発明によれば、温度変化に対
して安定な発振器が簡単な回路で、しかも小型化して実
現でき、実用的には極めて有用である。As described above, according to the present invention, an oscillator that is stable against temperature changes can be realized with a simple circuit and miniaturized, and is extremely useful in practice.
第１図は本発明のディジタル温度補償発振器の構成ブロ
ック図、
第２図は本発明の一実施例の部分ブロック図、第３図は
従来例の構成ブロック図である。
図において、
４は信号発振器、 ６は温度センサ、
８はアナログ／ディジタル変換器、
９は分周器、 １０は制御回路である。
本省９病へを理７′ローｚ７ｆｆｌ
第１図
半メジ８月偽−＊施ｆ列角署ｐ分７・口・ン７ｍ第２図
ｆＸＪ−４１１ｔ４１ｔ１５ニア・ａ、Ｖ７ ｍ第３図FIG. 1 is a block diagram of the configuration of a digital temperature compensated oscillator according to the present invention, FIG. 2 is a partial block diagram of an embodiment of the present invention, and FIG. 3 is a block diagram of the configuration of a conventional example. In the figure, 4 is a signal oscillator, 6 is a temperature sensor, 8 is an analog/digital converter, 9 is a frequency divider, and 10 is a control circuit. Main Ministry 9 disease to logic 7' low z7ffl Figure 1 half-medium August false - * service f column corner station p minute 7 mouth 7m Figure 2 fXJ-411t41t15 near a, V7 m Figure 3
Claims (1)
を分周し、且つ分周比が可変な分周器（９）と、前記信
号発振器（４）の温度を計測する温度センサ（６）と、
該温度センサ（６）の出力をディジタル信号に変換する
アナログ／ディジタル変換器（８）と、該アナログ／デ
ィジタル変換器（８）の出力によって前記分周器（９）
の分周比を制御する制御回路（１０）とで構成してなる
ことを特徴とするディジタル温度補償発振器。A signal oscillator (4), a frequency divider (9) that divides the output frequency of the signal oscillator (4) and has a variable division ratio, and a temperature sensor (9) that measures the temperature of the signal oscillator (4). 6) and
an analog/digital converter (8) that converts the output of the temperature sensor (6) into a digital signal; and an analog/digital converter (8) that converts the output of the temperature sensor (6) into a digital signal, and the frequency divider (9) according to the output of the analog/digital converter (8).
1. A digital temperature-compensated oscillator comprising: a control circuit (10) for controlling a frequency division ratio of the digital temperature-compensated oscillator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14443687A JPS63308402A (en) | 1987-06-09 | 1987-06-09 | Digital temperature compensated oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14443687A JPS63308402A (en) | 1987-06-09 | 1987-06-09 | Digital temperature compensated oscillator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63308402A true JPS63308402A (en) | 1988-12-15 |
Family
ID=15362163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14443687A Pending JPS63308402A (en) | 1987-06-09 | 1987-06-09 | Digital temperature compensated oscillator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63308402A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011055035A (en) * | 2009-08-31 | 2011-03-17 | Kyocera Kinseki Corp | Oscillation circuit |
-
1987
- 1987-06-09 JP JP14443687A patent/JPS63308402A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011055035A (en) * | 2009-08-31 | 2011-03-17 | Kyocera Kinseki Corp | Oscillation circuit |
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